Improvement in machines for cutting the threads of wood-screws



2 Sheets- Sheet 1.` SLOAT & SPRINGSTEEN.

Screw Threading Machine. Y No. 154. Patented'March30,1837.

2 Sheets-*Sheet 2. `SLOAT & SPRINGSTEEN.

Screw Threading Machine. y No. 154.` i l Patented March 30, 1837,l

A. I i' UNITED STATES@ PATENT OFFICE. A

JACOB sLOA'r, OF RAMAFO, AND THOMAS sFEINc'srEEN, OF Fouet-I- KEEPsIE, NEw YORK.

IMPROVEMENT IN MACHINES FOR CUTTING THE THREADS OF WOOD-SCREWS.

Speciiication forming part of Letters Patent No. 15.4, dated March 30, 1887.

To all whom it may concern:

Be it known that we, JACOB SLOAT, of Ramapo, in the county of Rockland and State of New York, and THOMAS SPEINGSTEEN, of

' Poughkeepsie, in the county of Dutchess and State o'tNew York, have invented a new and useful Improvement in Machines for Threading Screws commonly called Wood-Screws, and We do hereby declare that the following is a full and exactdescription of the construction andy Operation ot' the said machine as invented by us, reference being had to the drawings annexed.

In Figures 1 and 2, AA A A A are parts of the frame, which we make of cast-iron, ten feet long, two and one-haltl feet wide, and two and three-quarters feet high, which is a frame sufcient to place thereon six machines, three upon each side. A

Inr Fig. 1 and 2, B B are pivot-bars attached to cross-bars C C C, and is placed on the cen# ter of the frame lengthwise.

In Figs. 1 and 2, C C O are cross-bars secured to the stands D D D, and are parts of the frame-work or superstructure of the machine as well as the pivot-bar B B.

In Figs. l and 2, E E E are cutting-frames attached to pivot-bar B B by pivots at 'a a.

In Figs. 1 and 2, F are tool-holders attached to the cutting-frame by the adjusting screwnuts b b b, screw'pin c, and thumb-nut d.

In Figs. 1 and 2, G G are tooth-holdersl attached to the cutting-frame by pivots at e' e.

In Figs. l and 2, HH represent a spring attached to the cutting-frame by a pin f andV stirrup g, which stirrup is attached to a projection on the cross-bar of cutting-frame by adjusting screw-nuts.

In Figs. 1 and 2, I is a water-can having a stop-cock at h and a conductor which passes through tool-holder, in order to discharge water lor other preparation upon the tool during the cutting process, and is supported by arm A and pillar 7c, attached to the cutting-frame.

In Figs. 1 and 2, .I is a tooth for traversing the spindle, secured by the temper-screw i.

In Figs. 1 and 2, Kis a cutting-tool secured by the temper screw j, Fig. 1, which tool is adjusted in its place` by passing into the socket of the tool-holder until it comes in contact with a projecting or stop piece t t, Fig. 2,

v y(alixed upon the under side of the tool-holder covering a portion of the socket,) and the face of the wide part of the end bevel of the cutting-tool. cutting-tool see Fig. 3. It is prepared by applying the end bevel to the grindstoneuni` formly alike. Y

In Figs. 1 and 2, L L are spindles moving in boxes or stands D D at l l, having a pulley n,

four and one-half inches in diameter, driven by the belt o and connected with the pulley p, ten inches in diameter, on the driving-shaft P; also, on spindle'is a spur-gear q, about two and oneehalf inches diameter, which works into rackfT; also, on spindle an adj usting-collar s; also, attached to spindle is slide-bar Q by arms t t.

In Figs. 1 and 2, M is aleader, being an index-screw for traversing the spindle in cu'tf ting the screws. The same is-secured ontothe spindle.

' In Figs. 1 and 2, N is a chuck attached to a flexible j oint-piece on the leader end ofthe spindle by a coarse screw to said joint-piece. (See sectional drawings, Figs. 4 and L, Fig. 4, is part of the spindle, u, Fig. 4, is anotch, in which the holdfast O O, Figs. 1 and 2, works.

a, Fig. 4, is a j oint-piece passing into the spin- I dle and secured by the pin b,-Figs. 4 and'. On the front side of chuck at c, Fig. 4, is a slot or opening to admit the screw-head, at the center ofjwhich inside is a countersink corresponding with the shape of the screw-head,

standing in direct contact with the end of said joint-piece, which end of joint-piece passes entirely through the bed of said slot and fastens the screw in the chuck when screwed up in the operation of. the machine. d, Fig. 5, is a piece of india-rubber or any other elastic and hard substance fitting the cavity in spindle and placed on the small spindle e, Fig. 5, the object of which is toalylow the joint-piece to rock and adjust Aitself if the head of the screw is not square with the body of it, the hole f, Fig. 5, being made larger on the outside, but of the size of the pin in the middle.

In Fgs.` 1 and 2, O O are holdfasts placed on pivots fu o, held together by spring w, Fig. l, and opened by cam Fig. l, on shaft y, passing through stands D D, on the contra end of which shaft is an arm m, Fig. 2, against which the eccentric Zlworks when the handle For the form and shape ofsaidV 'n n is moved up or down in opening or closing the jaws of holdfast.

In Figs. 1 and 2, P is a driving-shaft with driving-pulleys attached.

In Figs. 1 and 2, Q is a slide-bar resting on friction-roller z, Fig. 1, and kept in place by stando c, Fig. l, which roller is placed on the arm t ,Fig. 1, (denominated the graduator,) on stud u u, Fig. 1, which is affixed to a shaft extending to the back side of stand D and passing through it, upon the contra end of which is aiiixed the arm U fu, Fig. 2, which arm is connected by the connecting-rod w w, Fig. 2, (having a regulating-pim) with lever :c 0c, Fig. 2, which lever oc- :1c isconnected with ratchet-bar S S at fastening-screw y y, Fig.2, and with catch-bar a a a at z z, Fig. 2, on which slide-bar is also affixed gage a a, Fig. 1, which gage is secured by yoke b b, Fig. 1, and indicates the form of the cut of screw. The follower e ezworks on said gage.

In Figs. 1 and 2, R is a spiral spring fastened to the lower girt of frame and the cuttingframe, it being of sufficient power to apply the toolfin cutting the screw, and is connected with Ilever r r, which lever isto disengage at pleasure the spring from cutting-frame.

In Figs. 1 and V2, S S represent a ratchet-bar having ratchets on both sides of the upper end of it and having a slide collar or pinat the lower end at o".

In Figs. 1and'2, T is a rack-gear working in pinion q, attached to stand D andbar'C.

In Figs. 1 and 2, U is a shaft supported on cross-bar C C, upon which is affixed spiral or transverse cam ff, which Vmoves the lever g g, which lever is attached to slide-bar Q and stud h h, which stud is affixed to Vpivot-barB; also, a winding-block c' c', which is connected by strap to lever or arm jj, which arm is attached Vand moves the belt-tightener K K; also, eccentric and cam ZZ, to which eccentric is attached strap and weight m fm; also, handle on lever-nn; also, an eccentric-cam CZ CZ CZ, Fig. 2, placed on the contra end of shaft under the cutting-frame to throw up the cuttingframe on the completion of a screw; also, a spring latch or catch ZJ b b. and b b b, Fig. 2, is moved back bya pin deviating from the center of shaft three-'eighths of an inchin the end of said shaft and working in a slot of said catch, which catch works into the back side of ratchet-bar and embracing it by a loose band having a space of one-half an inch between said bands and the front side of ratchet-bar when the catch is in a notch. 0 o, Fig. `l1), is a catch workin g into the front of Vratchet- In Figs. 1 and 2, V is a pulley on drivingshaft about three vinches in diameter, and drives pulley p p, about ten inches in diameter, by belt q q.

In Fig. 1, W is a changing pinion on movable stud c c c, affixed on cross-bar C, which pinion is substituted by a change of pinions corresponding to the length of screw and number of turns of the thread to be cut.

In Figs. 1 and 2, X is a cog-wheel about nine inches in diameter, working into pinion IV, upon the-shaft of which is an eccentriccam s s, Fig. 2, that raises the cutting-frame each turn of said shaft.

In Fig. 1, Y is a chip-box, which also catches the drippings of the water to be reused.

In Fig. l, Z is a screw-box having a conductor leading from under the chuck.

In Fig. 2, du is a shaft turned by cog-wheel X, and moves theV lifting-cam S S. e e e, Fig. 2, is a spring-catch on spindle L. Its use is to stop the spindle in a desired position on the completion of the screw, the arm of which spring is caught (when the spindle is drawn back) between the projecting piece g g g, Fig.-

2, and pin 7L 71. h, Fig. 2, and stops the revolution of the spindle, with the'slot c, Fig. 4:, in a vertical position, for'the purpose of convenience in disengagin'g the screw from the chuck when done and inputting the next screw in to be made. t it', Fig. 2, is anarm on eccentric Z Z to stop the shaft U and its appendages from turning too far, by which the parts connected with it are adjusted for operation. j j j, Fig. 2, is a spiral spring to hold up the catch-bar a, a a. 107070, Fig. 2, is a spiral spring att-ached to lever g g and a lxture bolted to cross-bar C and serves to throwjforward the spindle (by its connection with the slide Q) when the tooth `is disengaged from the leader M. Z'ZZ, Fig. 2, is a dead-rest or die, with eight recesses, (and may be more or less,) upon which the screw is rested'while cutting. fff, Figs. 1 and 2, handle of rack.

In Fig. 6 is a sectional drawing showing the revolving die used in the place of the deadrestshown in the principal drawing. a a are revolving dies of hardened steel about one and one-half inches diameter and `of any suitable length corresponding with the length of screw to be cut. b is .the point of the cutting-tool; c, a section of the screw; cZ, a wiper to disengage the chips. The arrows point the direction of the rollers. They are affixed on pivots to a regulating-piece attached to stands Din a mannerrto rise up or downto correspond with the size of the wire and to compensate for the wear of the rollers.

All of the above-described parts are Vsusceptible and may be varied in size and be made of different kinds of materials suggested by appropriate mechanical skill and workmanship.

Use cmd opemfion.--Place a screw-blank into the counter-sink in slot c, Fig. 41, with the left hand; hold with the right hand on handle fff; shove in the rack'l", by which the spindle is turned, the joint-piece @,Fign 5, and is screwed into chuck, the same'being held by the holdfast O O till saidjoint-piece comes in contact with the head of the screw blank and firmly secures it in the chuck. The handle 'an is then brought down and caught by catch-bar a a 0 which, by the action of the cam d cZ d, Fig. 2, lets down the cuttingframe, bringing the tooth into the leader and Vtool upon the screw-blank, and at the same time drops theY belt-tightenerk 7c upon the belt and starts the spindle, and at the same time disengages the transverse cam ff, Fig. 2, from the .bar g g and allows the spring Zak Za to throw forward the spindle, and at the same time by the action of the eccentric-cam Z Z, Figs. l and 2, upon arin m, Fig. 2, on shaft y, upon which the cam Fig. l, is placed, the holdfasts are released from the notches and the spindle allowed to turn, and at the same time the follower` e e is brought upon the highest part of the gage (L a, Fig. 1, and held firmly to it by spring R, and at the same time the spring-catch b b b and Z2 b b, Fig. 2, is allowed to move up into the ratchet-bar by the pin deviating from the center of shaft U, being brought forward and allowing the spring to throw forward the catch and enter a notch and retain the ratchet-bar till the cuttingframe again falls for another cut, when-the catch 0 o, Fig. 1, takes another notch in the ratchet, whereupon the spindle traverses back by the action of the tooth upon leader, and the irst cut is commenced, at which the slide commences' to draw back, and with it the gage from under the follower andthe tool let down upon the blank corresponding with the shape of the gage, be it more or less tapering, so that the screw may be made a gradual taper or all the Way of a size, or give it an acute taper at the point, making what we call gimlet-points, or any other shape desired. When the cut is finished, the cam s s lifts the cutting-frame and disengages the tooth from leader, when the spindle is again thrown forward, when the cam s s, having turned from under the cutting-frame, allows it to fall, bringing the tooth into leader again and the tool upon the blank, when another cutis made, and so on, a repetition of cuts-say, eightalways, however, regulated by the proportion of the pinion W to the wheel X, graduating each cut bythe action of the ratchet-bar and graduator t t, Fig. 1--to wit, at each successive cut. As the cutting-frame rises up it brings with it the ratchet-bar by the catch o o, Figs. 1 and 2, raising the ratchet-bar one notch, which the -spring latch or catch b Z) Z) and b b b, Fig. 2, catches on the contra side, and

by it turns the graduator by the arm o v, Fig. 2, toward its vertical position, and also by bringing the lever w xagainst the projecting piece Z Z Z Z, Fig. 2, on the arm of a a, a, and draws the same oft from the handle n n by a succession of lifts and allows the handle to rise by the'weight m m, which disengages the ratchet entirely, and it drops down upon slideband fr, when also the transverse cam drives back the lever g g and holds back the spindle, when the rack is drawn back and disengages the finished screw.

The operation of the graduator is as follows: At the commencement of the cutting of the screw the graduator is thrown out of the vertical position in an angle of forty-five degrees or thereabout, when, as the ratchetbar lifts up, it turns the graduatortoward. the vertical and dead-point of the circle, and consequently drops the cutting-frame less and less till it gets on the dead-point, when the tool is applied rso lightly that it simply burnishes the screws.

The individual parts of which we claim as new, and desire to secure by patent, are as follows, viz:

l. The gage and slide bar and the manner of applying it to the cutting process, by which a uniform shape is given to the screw.

2. The revolving die.

3. The cutting-frame and appendages, eX, cepting the tooth and spring H H, which are not new, but applied in a different way.

4. The slot in the chuck.

-5. The elastic substance in the joint-piece.

6. The'holdfast with the manner of opening the same.

7. The general combination of the parts of the machine, many of which are not new, but arranged different from any other device Iof which we have any knowledge.

JACOB SLOAT. THOMAS SPRINGSTEEN.

Witnesses to Thomas Springsteen:

FREDERICK GooDELL, EZEKIEL BROWN. Witnesses to Jacob Sloat:

E. BROWN, EDWARD SUFFERN. 

